# US 11,898,769 B2 · Condenser fan rotation restriction system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,769 B2 - Document ID: US11898769B2 - Status: Granted - Kind: B2 - Application number: 17/308,645 - Filed: 2021-05-05 - Published: 2021-11-11 - Granted: 2024-02-13 - Earliest claimed: 2021-05-05 - Assignees: Johnson Controls Tyco IP Holdings LLP - Applicants: Johnson Controls Technology Company - Inventors: Gnanesh Suvvada; Manjur Tamboli; Naushad Parapurath Monangat; Pavankumar Ramchandra Toraskar - Web page: https://patentgrep.com/patent/US11898769B2 ## CPC - F24F 1/38: Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings - F24F 13/1426: {characterised by actuating means} - F24F 1/16: Arrangement or mounting thereof - F24F 11/30: for purposes related to the operation of the system, e.g. for safety or monitoring - F24F 11/871: by controlling outdoor fans - F24F 13/14: built up of tilting members, e.g. louvre - F24F 13/30: Arrangement or mounting of heat-exchangers - F24F 2140/40: Damper positions, e.g. open or closed - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract A condenser fan assembly includes a first condenser fan and a first motor coupled to the first condenser fan via a first shaft, where the first motor is configured to drive rotation of the first condenser fan via the first shaft, and a second condenser fan and a second motor coupled to the second condenser fan via a second shaft, where the second motor is configured to drive rotation of the second condenser fan via the second shaft. The condenser fan assembly also includes a fan rotation restrictor configured to selectively block and enable rotation of the first shaft. ## Claims ### Claim 1 A condenser fan assembly, comprising: a first condenser fan and a first motor coupled to the first condenser fan via a first shaft, wherein the first motor is configured to drive rotation of the first condenser fan via the first shaft; a second condenser fan and a second motor coupled to the second condenser fan via a second shaft, wherein the second motor is configured to drive rotation of the second condenser fan via the second shaft; a fan rotation restrictor comprising an actuator and a plunger, wherein the actuator is configured to adjust a position of the plunger relative to the first shaft to engage and disengage the plunger with the first shaft to selectively block rotation of the first shaft; and a controller communicatively coupled to the actuator and to the second motor, wherein the controller is configured to: control the actuator to adjust the position of the plunger to engage with the first shaft; and control the second motor to drive rotation of the second condenser fan while the plunger is engaged with the first shaft. ### Claim 2 (depends on 1) The condenser fan assembly of claim 1, wherein the controller is configured to control operation of the actuator based on an operational state of the first condenser fan. ### Claim 3 (depends on 2) The condenser fan assembly of claim 2, wherein the controller is configured to: determine that the first condenser fan is in a non-operating state; and instruct the actuator to bias the plunger against the first shaft in response to determining that the first condenser fan is in the non-operating state. ### Claim 4 (depends on 3) The condenser fan assembly claim 3, wherein the controller is configured to instruct the actuator to disengage the plunger from the first shaft in response to a signal indicative of a transition of the first condenser fan from the non-operating state to an operating state. ### Claim 5 (depends on 1) The condenser fan assembly of claim 1, wherein the first shaft comprises a sleeve extending circumferentially about the first shaft, wherein the actuator is configured to bias the plunger against the sleeve in an engaged configuration. ### Claim 6 (depends on 5) The condenser fan assembly of claim 5, wherein the sleeve comprises an elastomeric material. ### Claim 7 (depends on 6) The condenser fan assembly of claim 6, wherein the elastomeric material comprises rubber or silicone. ### Claim 8 (depends on 1) The condenser fan assembly of claim 1, wherein the actuator comprises a solenoid. ### Claim 9 (depends on 1) The condenser fan assembly of claim 1, wherein the fan rotation restrictor is a first fan rotation restrictor, the actuator is a first actuator, and the plunger is a first plunger, wherein the condenser fan assembly comprises a second fan rotation restrictor comprising a second actuator and a second plunger, and wherein the second actuator is configured to adjust a position of the second plunger to engage and disengage the second plunger with the second shaft to selectively block rotation of the second shaft. ### Claim 10 (depends on 9) The condenser fan assembly of claim 9, wherein the controller is configured to control operation of the first actuator and the second actuator independently of one another, control operation of the first actuator based on a first operational state of the first condenser fan, and control operation of the second actuator based on a second operational state of the second condenser fan. ### Claim 11 (depends on 10) The condenser fan assembly of claim 10, further comprising a shroud of a condenser, wherein the shroud defines a first passage and a second passage, the first condenser fan is configured to discharge air from the condenser via the first passage, and the second condenser fan is configured to discharge air from the condenser via the second passage. ### Claim 12 (depends on 1) The condenser fan assembly of claim 1, wherein the first motor comprises a first housing, the first shaft extends from an interior of the first housing to an exterior of the first housing, and the fan rotation restrictor is disposed within the interior of the first housing. ### Claim 13 (depends on 1) The condenser fan assembly of claim 1, wherein the controller is configured to output a signal to the first motor based on the position of the plunger. ### Claim 14 (depends on 13) The condenser fan assembly of claim 13, wherein the controller is configured to output the signal to the first motor based on a determination that the plunger is disengaged from the first shaft. ### Claim 15 A heating, ventilation, and air conditioning (HVAC) system, comprising: a condenser; a fan deck coupled to the condenser to define a chamber between the condenser and the fan deck, wherein the fan deck comprises a first passage and a second passage formed therein; a first condenser fan comprising a first motor coupled to the first condenser fan via a first shaft, wherein the first motor is configured to drive rotation of the first condenser fan via the first shaft to draw a first air flow across the condenser and discharge the first air flow from the chamber via the first passage; a second condenser fan comprising a second motor, wherein the second motor is configured to drive rotation of the second condenser fan to draw a second air flow across the condenser and discharge the second air flow from the chamber via the second passage; a fan rotation restrictor comprising an actuator and a plunger, wherein the actuator is configured to adjust a position of the plunger relative to the first shaft to engage and disengage the plunger with the first shaft to selectively block and enable rotation of the first condenser fan; and a controller communicatively coupled to the fan rotation restrictor and to the second motor, wherein the controller is configured to: control operation of the fan rotation restrictor to adjust the position of the plunger to engage the plunger with the first shaft; and control the second motor to drive rotation of the second condenser fan while the plunger is engaged with the first shaft. ### Claim 16 (depends on 15) The HVAC system of claim 15, wherein the first condenser fan comprises a plurality of blades coupled to the first shaft of the first motor wherein the actuator is configured to adjust the plunger between an engaged configuration and a disengaged configuration, and wherein the plunger abuts the first shaft in the engaged configuration, and the plunger is apart from the first shaft in the disengaged configuration. ### Claim 17 (depends on 16) The HVAC system of claim 16, wherein the first shaft comprises a sleeve extending about the first shaft, wherein the controller is configured to instruct the actuator to bias the plunger against the sleeve in the engaged configuration. ### Claim 18 (depends on 17) The HVAC system of claim 17, wherein the sleeve comprises rubber. ### Claim 19 (depends on 15) The HVAC system of claim 15, wherein the controller comprises an interlock configured to coordinate operation of the fan rotation restrictor and the first condenser fan, wherein the controller is configured to instruct the fan rotation restrictor to engage with the first shaft of the first motor in response to an operating state of the first condenser fan being an inactive operating state, and the controller is configured to instruct the fan rotation restrictor to disengage with the first shaft of the first motor in response to the operating state being an active operating state.